Likewise, Mirabel has always had jetways... 6 to be precise (gates 145 to 150)... They are now mainly used by Air Transat, Royal and Canada 3000, although C3 often uses the PTVs (passenger transport. vehicules), I've never seen their 330 at the jetways.
Now that international scheduled service has left YMX, the remaining flights can mostly use the jetways, and that's why we don't see the PTVs really that much.
I've always been a fan of Mirabel, and I truly believe that flights will head back there sooner than many people think, because it's never going to shut down. But I just don't want to launch the everlasting debate once more.